The description of Chat on WhatsApp without Saving a Number : OWC
This app lets you open a WhatApp chat without adding/saving the contact number in your phone's contact. You don't have to worry about talking/chatting to a temporary number or waiting for the number to save first and then refresh on WhatsApp to chat. Now just type or paste the number in "Open WhatsApp Chat" and boom, WhatsApp chat will open with that person.
We have listened to all the reviews you gave. 1. Added all country codes with Search feature. 2. You won't have to select the country code again and again. The last used country code will be saved automatically.